Written in 1870 and just as relevant today.
Simply replace Irish with ‘Eastern European’ or ‘Muslim’ (though of course there is still some anti-Irish racism among the British).
Every industrial and commercial centre in England now possesses a working class divided into two hostile camps, English proletarians and Irish proletarians. The ordinary English worker hates the Irish worker as a competitor who lowers his standard of life. In relation to the Irish worker he regards himself as a member of the ruling nation and consequently he becomes a tool of the English aristocrats and capitalists against Ireland, thus strengthening their domination over himself. He cherishes religious, social, and national prejudices against the Irish worker. His attitude towards him is much the same as that of the “poor whites” to the Negroes in the former slave states of the U.S.A.. The Irishman pays him back with interest in his own money. He sees in the English worker both the accomplice and the stupid tool of the English rulers in Ireland.
This antagonism is artificially kept alive and intensified by the press, the pulpit, the comic papers, in short, by all the means at the disposal of the ruling classes. This antagonism is the secret of the impotence of the English working class, despite its organisation. It is the secret by which the capitalist class maintains its power. And the latter is quite aware of this.